Earlier this year, Subaru announced the WRX STI would get a 5-horsepower boost for 2019. No, it wasn’t much, but at least the STI would no longer be outgunned by the turbocharged four-cylinder Mustang. Subaru’s latest special edition STI, however, comes with a much less underwhelming boost in power. It’s called the WRX STI TC 380, and